n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 5 |
4 | 14 |
5 | 74 |
6 | 474 |
7 | 3114 |
8 | 24240 |
9 | 219456 |
10 | 2231280 |
11 | 23753520 |
12 | 288099360 |
13 | 3692907360 |
14 | 51677246880 |
15 | 775999798560 |
16 | 12364465397760 |
17 | 208583679951360 |
18 | 3770392002048000 |
19 | 71251563061002240 |
20 | 1421847102467635200 |
21 | 29861872557056870400 |
22 | 655829140087057305600 |
[1,1,1,5,14,74,474,3114,24240,219456,2231280, 23753520,288099360,3692907360,51677246880, 775999798560,12364465397760,208583679951360, 3770392002048000,71251563061002240, 1421847102467635200,29861872557056870400, 655829140087057305600] |